package com.jiaojiao.reggie.controller;

import com.jiaojiao.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        assert originalFilename != null;
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名，避免重复，造成文件覆盖
        String fileName = UUID.randomUUID().toString() + substring;

        //创建目录
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdir();
        }

        try {
            //将临时文件转存到指定文件夹
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e){
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出六，写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            byte[] bytes = new byte[1024];
            int len = 0;
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (FileNotFoundException e){
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
